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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Obligations and Funded Status) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments $ (6,407) $ (136,331) $ 1,062 $ (142,738) $ (1,773)
Change in benefit obligations          
Benefit obligations at beginning of year     558,169 1,045,471  
Service cost     17,689 19,933 19,062
Interest cost     23,578 36,002 42,485
Plan participants' contributions     148 185  
Acquisitions     0 6,170  
Actuarial (gain) loss     28,004 (42,640)  
Benefits Paid     (31,308) (32,217)  
Settlement/curtailment     (24,068) (463,943)  
Currency translation     (7,482) (10,792)  
Benefit obligations at end of year 558,169   564,730 558,169 1,045,471
Change in plan assets          
Balance at the beginning of year     576,101 1,010,937  
Actual return on plan assets     38,264 9,298  
Employer contributions     21,373 50,468  
Plan participants' contributions     148 185  
Acquisitions     0 5,995  
Benefits paid     (30,146) (30,358)  
Settlement     0 (462,601)  
Currency translation     (6,655) (7,823)  
Balance at the end of year 576,101   599,085 576,101 $ 1,010,937
Net amount recognized          
Funded status at end of year 17,932   34,355 17,932  
Unrecognized actuarial net loss 156,019   146,585 156,019  
Unrecognized prior service cost (1,304)   (18) (1,304)  
Unrecognized transition assets, net 41   37 41  
Net amount recognized in the balance sheets $ 172,688   $ 180,959 $ 172,688